BUCKET CYLINDER 0995557 - Caterpillar

Stick Out
Illustration 1 g01621102
Hydraulic schematic for STICK OUT (1) Stick cylinder (2) Passage (3) Check valve (4) Stick lowering control valve (5) Pilot control valve (boom) (6) Return passage (7) Passage (8) Passage (9) Passage (10) Stick I control valve (11) Load check valve (12) Center bypass passage (13) Main control valve (14) Center bypass passage (15) Stick II control valve (16) Check valve (17) Passage (18) Passage (19) Pilot line (20) Parallel feeder passage (21) Return passage (22) Pilot line (23) Line (24) Pilot line (25) Pilot line (26) Pressure reducing valve (boom priority) (27) Return line (28) Drive pump (29) Idler pump (30) Pilot line (31) Selection valve (STICK IN)
Illustration 2 g01621224
Main control valve (10) Stick I control valve (15) Stick II control valveWhen the stick hydraulic circuit is operated independently of other hydraulic circuits, stick I control valve (10) and stick II control valve (15) are operational for the STICK OUT operation. When the stick I control valve and the stick II control valve are operated, the oil delivery from idler pump (29) and drive pump (28) is combined. The oil delivery from both pumps flows to stick cylinder (1) in order to perform a stick operation.The oil delivery from drive pump (28) flows through parallel feeder passage (20) in main control valve (13) to stick II control valve (15). The oil delivery from idler pump (29) flows through center bypass passage (12) in main control valve (13) to stick I control valve (10) .When the joystick for the stick is moved to the STICK OUT position, the pilot oil flows from pilot control valve (5) through pilot line (24). The pilot oil flow then divides into two flow paths. Part of the pilot oil flows through pilot line (30) to stick I control valve (10) in main control valve (13). The remainder of the pilot oil flows to pressure reducing valve (26), and pilot line (22) to stick II control valve (15) in the main control valve.The pilot oil in pilot line (30) shifts the spool of stick I control valve (10). The oil delivery from idler pump (29) that is in center bypass passage (12) flows through load check valve (11), passage (8), and passage (7) to stick lowering control valve (4). The oil